The word "unpreventably" refers to something that cannot be avoided or stopped. Its antonyms are words that indicate the opposite meaning. Some of the antonyms for unpreventably are "preventable," "avoidable," "obstructable," and "controllable." Preventable means capable of being stopped or avoided, while avoidable refers to something that can be prevented or circumvented. Obstructable means able to be blocked or hindered, and controllable means capable of being regulated or managed. Using antonyms like preventable, avoidable, obstructable, and controllable can help you express your ideas more thoroughly, emphasizing that a particular situation could have been avoided or managed better.